Assembly arrangement between a bearing inner race and a journal, race and journal suitable for such an arrangement, and turbomachine fitted therewith

1. An assembly arrangement between an inner race of a bearing and a journal supported in rotation in said bearing, said journal having an axis, wherein said assembly arrangement comprises:

a journal annular groove made on an outer face of said journal and a race annular groove made on an inner face of said inner race, said two annular grooves interacting to form an annular channel between said journal and said inner face when the two annular grooves are placed opposite one another,

a retaining ring placed in said annular channel, which prevents a relative movement, in translation along said axis, between said journal and said inner race, and

at least one recess of said journal and at least one tooth of said inner race, which interact to prevent a relative movement, in rotation about said axis, between said journal and said inner race.

2. An assembly arrangement according to claim 1 , wherein each tooth extends radially inwards from the inner face of the inner race.

3. An assembly arrangement according to claim 1 , wherein each recess consists of a blind hole of the journal.

4. An assembly arrangement according to claim 1 , wherein each recess consists of a longitudinal groove of the journal.

5. An assembly arrangement according to claim 1 , further comprising at least one opening connecting said race annular groove to an outer face of said inner race.

6. An assembly arrangement according to claim 1 , wherein said retaining ring includes a split oriented so as to facilitate insertion of said retaining ring in said annular channel.

7. An assembly arrangement according to claim 1 , wherein said journal annular groove and said at least one recess are placed either side of at least one oil duct which opens onto an outer face of the journal and carries oil to said inner race through said journal.

8. An assembly arrangement according to claim 1 , further comprising a bevel of the inner race, in the vicinity of the race annular groove.

9. An assembly arrangement according to claim 1 , further comprising a race radial shoulder and a journal radial shoulder, which interact to produce an axial abutment of said inner race on said journal.

10. An assembly arrangement according to claim 1 wherein said inner race comprises:

a race body designed to interact with a bearing outer race,

a first race end comprising first race assembly means for preventing a relative movement, in translation along the said axis, between said journal and said inner race, and

a second race end comprising second race assembly means for preventing a relative movement, in rotation about said axis, between said journal and said inner race.

11. An assembly arrangement according to claim 10 , wherein said first race assembly means comprise a race annular groove made on an inner face of said inner race.

12. An assembly arrangement according to claim 11 , wherein the first race assembly means comprise a bevel made at the extremity of said first race end, on an inner face of said inner race and in the vicinity of said race annular groove.

13. An assembly arrangement according to claim 10 , wherein said first race assembly means comprise at least one opening connecting said race annular groove to an outer face of the said inner race.

14. An assembly arrangement according to claim 10 , wherein said second race assembly means comprise at least one tooth extending radially inwards at the extremity of the second race end.

15. An assembly arrangement according to claim 10 , further comprising a race radial shoulder between the race body and the first race end.

16. A turbomachine comprising the bearing, the journal, and the assembly arrangement according to claim 10 . wherein the assembly arrangement is between the inner race of the bearing and the journal is supported in rotation in said bearing.

17. An assembly arrangement according to claim 1 wherein said journal comprises:

first journal assembly means for preventing a relative movement, in translation along the said axis, between said journal and said inner race, and

second journal assembly means for preventig a relative movement, in rotation about said axis, between said journal and said inner race.

18. An assembly arrangement according to claim 17 , wherein said first journal assembly means comprise a journal annular groove made on an outer face of said journal.

19. An assembly arrangement according to claim 17 , wherein said second journal assembly means comprising at least one recess made in said journal.

20. An assembly arrangement according to claim 19 , wherein each recess consist in a blind hole of the journal.

21. An assembly arrangement according to claim 19 , wherein each recess consists of a longitudinal groove of the journal.

22. An assembly arrangement according to claim 17 , further comprising a journal radial shoulder configured to interact with a race radial shoulder to produce an axial abutment of said inner race on said journal.

23. An assembly arrangement according to claim 17 , further comprising at least one oil duct which opens onto an outer face of said journal, said oil duct being placed between said first journal assembly means and said second journal assembly means.

24. A turbomachine comprising the bearing, the journal, and the assembly arrangement according to claim 17 , wherein the assembly arrangement is between the inner race of the bearing and the journal is supported in rotation in said bearing.

25. A turbomachine comprising the bearing, the journal, and the assembly arrangement according to claim 1 , wherein the assembly arrangement is between the inner race of the bearing and the journal is supported in rotation in said bearing.